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- Message-Id: <9110161431.AA18499@tictac.cert.sei.cmu.edu>
- Date: Wed, 16 Oct 91 10:30:20 EDT
- From: Seth Robertson <seth@ctr.columbia.edu>
- Subject: TCP/IP Connection Monitoring
-
- It is occasionally needed to perform ethernet monitoring to check for
- unauthorized connections (connections from random machines around the
- internet to the telnet (or other) ports). You might not want to
- restrict all access, but one the other hand you want to keep an eye on
- what is going on. The only problem is that programs like tcpdump or
- etherfind monitor the ethernet on a packet-by-packet scale instead of
- on a connection bases (one line per connection) which makes it
- difficult to get an idea of what is happening (since you can easily
- lose or forget about packets that get overwhelmed by voluminous
- connections. So in order to solve this problem I wrote conmon.
-
- conmon takes the output of tcpdump and prints a given connection only
- the first time it is seen so that you can easily see all connections.
-
- Every screenful of connections it clears the current list of
- connections so that active connections will be seen on the new screen.
-
- If the above is slightly confusing, I don't blame you. In any case it
- should be fairly obvious when you try it. It will require a little
- bit of configuring to get the tcpdump command line correct.
-
- Both tcpdump and conmon are available for anonymous ftp from
- ftp.ctr.columbia.edu [128.59.64.40]
-
-
- -Seth Robertson
- seth@ctr.columbia.edu
-
-